Volume no :56, Issue no: 1, March (2019)

THE USE OF LESSER-KNOWN THEOREMS AND FORMULAS AS A TOOL FOR OBTAINING ELEGANT SOLUTIONS IN EUCLIDEAN GEOMETRY

Author's: Moshe Stupel, Shula Weissman and Avi(Berman) Sigler
Pages: [67] - [92]
Received Date: February 18, 2019; Revised April 14, 2019
Submitted by:
DOI: http://dx.doi.org/10.18642/jmsaa_7100122033

Abstract

The methods of teaching and instruction in mathematics are derived from the program of studies and its goals. One of the principal goals of studies of mathematics is to provide the students with methods of reasoning that may assist them in other fields of study and knowledge, and to develop such methods.

The meaning of “learning to think” is: the teacher of mathematics should develop the ability of students to apply information, perform analysis and synthesis at an adequate level, of basic properties, rules and the theorems that they studied at an earlier stage of the teaching process.

By using methods of solution and knowledge from other fields of mathematics one can obtain simpler and faster solutions.

Finding another method of solution by using the same mathematical field, and especially from another field, contributes to development of reasoning and raises it to a higher level.

Implementation of previous knowledge in a new situation that results in a shorter and simpler solution or a more beautiful solution increases enjoyment and satisfaction from studies of the subject.

Integration of fields in problem solution gives the students and wider outlook to mathematics as a comprehensive discipline, while creating connections between its different branches.

The ability to handle different tasks in Euclidean geometry, some of which are hard or complex, depends to a large extent on the “mathematical toolbox” available to student. The wider and richer it is with lesser-known theorems and formulas, the much higher is the student’s ability to cope such problems, and it is very likely that they will be able to achieve elegant, short and aesthetic solutions. In order to illustrate the importance of the “mathematical toolbox”, we present seven interesting tasks in Euclidean geometry that require theorems and formulas which are not usually known to the students. In six of the tasks we presented more than one solution. Usually the solution obtained by an unknown theorem or formula is surprising, short and the prettiest of all the solutions.

Keywords

lesser-known theorems, elegant solutions, mathematical toolbox.